Loans and Leases (Details Textual) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018 USD ($) Contract	Sep. 30, 2017 USD ($) Contract	Sep. 30, 2018 USD ($) Contract		Sep. 30, 2017 USD ($) Contract	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-Modification Outstanding Recorded Investment		$ 57,736	$ 29,018	$ 76,517		$ 63,597
Post-Modification Outstanding Recorded Investment		$ 60,187	$ 19,226	$ 77,909		$ 53,097
Number of Loans | Contract		0	0	0		0
Nonaccrual loans and leases		$ 112,972		$ 112,972			$ 155,784	[1]
Receivable, 90 or more days past due		14,315		14,315			14,200
Receivable, 30-89 days past due		18,221		18,221			3,200
Financing receivable, nonaccrual status, current							138,400
Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases		83,200		$ 83,200
Percentage of nonaccrual loans and leases				73.70%
Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	[2]						155,784
Receivable, 90 or more days past due	[3]						14,165
Receivable, 30-89 days past due	[3]						48,435
Nonaccrual
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable, 90 or more days past due		14,300		$ 14,300
Receivable, 30-89 days past due		1,600		1,600
Financing receivable, nonaccrual status, current		97,000		97,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases		79,718		79,718
Receivable, 90 or more days past due		4,876		4,876
Receivable, 30-89 days past due		1,250		1,250
Commercial | Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	[1],[2]						86,851
Receivable, 90 or more days past due							3,036
Receivable, 30-89 days past due							9,723
Commercial | Asset Based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-Modification Outstanding Recorded Investment		28,947	$ 0	28,947	[4]	$ 665
Post-Modification Outstanding Recorded Investment		33,947	$ 0	33,947	[4]	$ 665
Nonaccrual loans and leases		34,619		34,619
Receivable, 90 or more days past due		655		655
Receivable, 30-89 days past due		$ 0		0
Commercial | Asset Based | Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	[2]						33,553
Receivable, 90 or more days past due							690
Receivable, 30-89 days past due							$ 344
Commercial Asset Based Loan [Member] | Commercial | Asset Based
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-Modification Outstanding Recorded Investment	[4]			27,300
Post-Modification Outstanding Recorded Investment	[4]			$ 32,300

[1] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[2] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[3] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[4] One commercial asset-based loan with a pre-modification balance of $27.3 million and a post-modification balance of $32.3 million was a restructuring of a loan secured by oil services equipment that was originally restructured in 2015 after being placed on nonaccrual status. The loan has since been extended four times, the last in the fourth quarter of 2017. As part of the current restructuring, additional funds were advanced in exchange for the receipt of additional equipment collateral and a partial personal guaranty.